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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 173 · 40 questions
TalentJR

Robot tip (Room ÷ speed): Room = distance now − gap to keep; time = room ÷ speed. Stopping point = distance when braking starts − braking distance. Distance between sensor checks = speed × time between checks (ms ÷ 1000 for seconds).

NameDateTime takenScore ___ / 40
  1. 1.🛑 A robot moves 40 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  2. 2.🛑 A robot moves 50 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  3. 3.🛑 A robot moves 10 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  4. 4.🛑 A robot is 180 cm from a wall. It drives at 30 cm per second until it is 60 cm away, then slows to 10 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  5. 5.🛑 When should a robot start slowing down? (a) before it is too close (b) only when it is off (c) after hitting the wall (d) never
  6. 6.🛑 A robot moves 20 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  7. 7.🛑 A robot needs 50 cm to stop once it brakes. It starts braking when its sensor sees a wall 60 cm away. How far from the wall does it stop (in cm)?
  8. 8.🛑 A robot needs 30 cm to stop once it brakes. It starts braking when its sensor sees a wall 60 cm away. How far from the wall does it stop (in cm)?
  9. 9.🛑 A robot is 70 cm from a wall and drives towards it at 5 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  10. 10.🛑 A robot is 75 cm from a wall and drives towards it at 5 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  11. 11.🛑 A faster robot needs a … distance to stop. (a) longer (b) shorter (c) negative (d) zero
  12. 12.🛑 A robot needs 20 cm to stop once it brakes. It starts braking when its sensor sees a wall 140 cm away. How far from the wall does it stop (in cm)?
  13. 13.🛑 A robot moves 50 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  14. 14.🛑 A robot moves 10 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  15. 15.🛑 A robot is 70 cm from a wall and drives towards it at 10 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  16. 16.🛑 A robot is 60 cm from a wall and drives towards it at 5 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  17. 17.🛑 A robot is 50 cm from a wall and drives towards it at 5 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  18. 18.🛑 A robot needs 5 cm to stop once it brakes. It starts braking when its sensor sees a wall 80 cm away. How far from the wall does it stop (in cm)?
  19. 19.🛑 A robot moves 20 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  20. 20.🛑 A robot is 140 cm from a wall and drives towards it at 20 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  21. 21.🛑 A robot is 50 cm from a wall and drives towards it at 10 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  22. 22.🛑 A robot moves 30 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  23. 23.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it is too light (c) brakes are magic (d) it likes to slide
  24. 24.🛑 A robot is 450 cm from a wall. It drives at 50 cm per second until it is 100 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  25. 25.🛑 A robot is 140 cm from a wall. It drives at 20 cm per second until it is 60 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  26. 26.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to react in time (c) to waste battery (d) to look busy
  27. 27.🛑 A robot needs 10 cm to stop once it brakes. It starts braking when its sensor sees a wall 110 cm away. How far from the wall does it stop (in cm)?
  28. 28.🛑 A robot needs 135 cm to stop once it brakes. It starts braking when its sensor sees a wall 140 cm away. How far from the wall does it stop (in cm)?
  29. 29.🛑 A robot is 260 cm from a wall. It drives at 30 cm per second until it is 50 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  30. 30.🛑 A robot is 80 cm from a wall and drives towards it at 10 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  31. 31.🛑 A robot is 90 cm from a wall and drives towards it at 10 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  32. 32.🛑 A robot is 170 cm from a wall. It drives at 40 cm per second until it is 50 cm away, then slows to 10 cm per second and stops when it is 20 cm away. How many seconds does the whole trip take?
  33. 33.🛑 A robot needs 70 cm to stop once it brakes. It starts braking when its sensor sees a wall 90 cm away. How far from the wall does it stop (in cm)?
  34. 34.🛑 A robot is 125 cm from a wall. It drives at 25 cm per second until it is 50 cm away, then slows to 5 cm per second and stops when it is 20 cm away. How many seconds does the whole trip take?
  35. 35.🛑 A robot is 260 cm from a wall. It drives at 40 cm per second until it is 60 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  36. 36.🛑 A robot is 165 cm from a wall and drives towards it at 15 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  37. 37.🛑 A robot needs 10 cm to stop once it brakes. It starts braking when its sensor sees a wall 40 cm away. How far from the wall does it stop (in cm)?
  38. 38.🛑 A robot needs 70 cm to stop once it brakes. It starts braking when its sensor sees a wall 110 cm away. How far from the wall does it stop (in cm)?
  39. 39.🛑 A robot is 40 cm from a wall and drives towards it at 5 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  40. 40.🛑 A robot moves 30 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =

Answer key

  1. 8
  2. 25
  3. 2.5
  4. 9
  5. before it is too close
  6. 10
  7. 10
  8. 30
  9. 12
  10. 9
  11. longer
  12. 120
  13. 10
  14. 5
  15. 5
  16. 6
  17. 4
  18. 75
  19. 2
  20. 6
  21. 2
  22. 6
  23. it keeps moving a bit
  24. 25
  25. 14
  26. to react in time
  27. 100
  28. 5
  29. 15
  30. 7
  31. 6
  32. 6
  33. 20
  34. 9
  35. 15
  36. 9
  37. 30
  38. 40
  39. 6
  40. 7.5

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